Fastening field-magnets to spiders.



PATENTED APR.28,1903.

H. G. REIST.

FASTENING FIELD MAGNETS T0 SPIDERS.

APPLICATION FILED 00T.18, 1901.

2 SHEETS-SHEET 1- 10 MODEL.

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by FHfI PATENTED APR. 28, 1903..

H. G. REIST.

FIELD MAGNETS TO SPIDERS.

IOATION FILED 001218, 1901.

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HENRY G. REIST, OF SOHENEOTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

FASTENING FIELD-MAGNETS TO SPIDERS.

SPECIFICATION-forming part of Letters Patent N 0. 726,347, dated April 28, 1903.

7 Application filed ctober18, 1901. Serial No. 79,142. No model.)

To ail whom it ncty concern:

Be it known that I, HENRY G. Enter, a citizen of the United States, residing at Schenectady, county of Schenectady, State of New York, have invented certain new and useful Improvements in Fastening Field-Magnets to Spiders, of which the following is a specification.

This invention relates to dynamo-electric I0 machines; and its object is to provide improved means for attaching the field-magnets to the spider of a revolving-field machine. When rotating at high speeds, a strong centrifugal force is exerted on the field-magnets, so that they must be securely fastened to the spider to avoid accidents. I provide each magnet with a base-plate, which is firmly bolted to the rim of the spider.

In the accompanying drawings, Figure 1 isv an end elevation of a portion of the revolv ing-field magnet of an alternating-current generator. Fig. 2 is a side elevation, partly 1n section. Fig. 3 is a bottom plan View of part of the clamping base-plate on an en- 2 5 larged scale. Fig. 4 is a cross-section of the same on the line a 4:, Fig.3. Fig. 5 is an end elevation similar to Fig. 1, showing a modified construction. Fig. 6 is a section of the same on an axial plane. Fig. 7 is a bottom plan view of the base-plate. I Fig. 8 is a crosssection of the sameon the line 8 8, Fig. 7.

The spider A has a cylindrical rim a, on which are secured the radially projecting field-magnets B. Each magnet has a core or pole-piece 1), preferably composed of laminations of sheet metal clamped together by end plates 1) and bolts b pole-piece has a laterally-extending flange b to confine the winding 1;, which may be of 0 any ordinary construction.

In order to fasten the magnets to the spider, the pole-pieces are attached to base-plates, which in turn are bolted to the rim of the spider. Various modes of attaching the polepieces to the base-plate may be devised; but

I prefer the two illustrated in the drawings;

On Sheet lthe pole-piece has a downwardlyextending portion Z7 shaped to interlock with the base-plate. The portion b is preferably a dovetail rib, as shown, and the base-plate O has a correspondingly-shaped opening en- The outer end of the gaging with said rib. The plate is made in two parts, being preferably halved on a central longitudinal line in order that it may be readily engagedwith the rib. Thetwo parts are clamped together on the rib Z2 as by transverse bolts 0. At each end of the baseplate is a perforated lug c to receive the bolts D, which fasten it to the rim of the spider. In the modification shown on Sheet 2 the 6o pole-piece has a transverse hole I)", through which passes a bar E. The end plates 19 are fastened to this bar by screws U. The baseplate 0 is solid and has holes 0 preferably countersunk, as shown, to receive screws F, which engage with tapped holes in the bar E, thus attaching the magnet to the baseplate, which is then bolted to the rim of the spider by bolts D, passing through the perforated lugs c.

It will be observed that in both modifications the base-plate is clamped-against the lower end of the pole-piecein the first by the wedging action of the dovetail rib and the beveled edges of the base-plate, and in the secon d by the screws pulling downward on the transverse bar.

WVhat I claim as new, and desire to secure by Letters Patent of the United States, is-

1. Means for fastening a laminated polepiece to a support, comprising a base-plate, means engaging the lower ends of laminations and clamping them to the said baseplate, and means for fastening the base-plate to the support.

2. Means for fastening a laminated polepiece to a support, comprising a base-plate, devices for clamping said base-plate to the lower ends of laminations in said pole-piece, and means for fastening the base-plate to the support. p

3. The combination with-the spider of a dynamo-electric machine, of a magnet thereon, a base-plate underlying said magnet and having perforated-ears at its ends, means for at 5 taching the base-plate to thepole-piece of -the magnet, and bolts passing through the spider and the ears on the base-plate.

4. The combination with the spider of a dynamo-electric machine, of a magnet therefor having a pole-piece provided with an undercut rib, a base-plate having beveled edges to 2 mam? engage With said rib, and means for fastening the base-plate to said spider,

5. The combination with the spider of a dynamo-electric machine, of a magnet therefor having a pole-piece provided with a dovetail rib, and a base-plate made in two parts, adapted to engage with said rib and provided with means for fastening it to the spider.

6. The combination with the spider of a dy- 1O name-electric machine, of a magnet therefor having a laminated pole-piece provided with 

